3#if __cplusplus >= 201103L
19 std::pair<
const char* ,
const char* >
what() const noexcept;
24# error "Must compile with C++11 support or newer"
25# pragma message("Current standard is " ARGX_TOSTRING(__cplusplus))
ARGXAddError(const std::string &msg, const std::string &help="")
std::pair< const char *, const char * > what() const noexcept